It's a conflict that he had to resolve, I don't see it as requiring him to reconcile all his possible personalities, just the trauma that resulted in Steven existing at all.
We've had plenty of outright references to 'something else' and I'm sure we'll get that beat over our heads a couple of times in the finale if we don't have a outright montage of the different ways that personality has surfaced and a reveal as the show ends on a 'the crazy will continue next time you see Moon Knight'.
I'm really looking forward to what they do with the occult thread in the MCU, no reason not to expect Blade, Black Knight, Moon Knight, Elsa Bloodstone (
rumored to be coming in the Halloween special) and maybe Daredevil or Dr. Strange to not end up crossing over into each others' series and movies.